Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire;

FIG. 2 is a front view thereof, wherein top, bottom and rear views are identical and thus omitted;

FIG. 3 is a left side view thereof, wherein the right side view is identical and thus omitted;

FIG. 4 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 5 is an end view taken along line A-A in FIG. 4.

In the drawings, the broken lines defining the sidewall and the inner bead of the tire depict environmental subject matter that forms no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 